How do I skip animation between 2 keyframes?
If you're just making a video, add the scene of the animation into the blender VSE and cut out the 101-199 frame range of that animation strip. This will allow you to preview and render your animation without those frames. Additionally, the keyframes will not be affected. If you eventually wish to go back and include the frames again, they will still exist.

Alternatively, you could do as Mr Zak suggested and move all the keyframes from the 200th frame and onward back 99 frames. This would make animation appear as though it is skipping all the frames in the 101-199 range.

To do that, go to drop down menu of blender layouts found in the top left and select the animation layout.



In the dope sheet editor found in the top left, check to see if there are any keyframes in the 101-199 frame range. If there are any, delete them. The range should be made empty.

After the frame range is clear, 


Set the vertical bar at the 200th frame and press ] to select all the keyframes to the right of the vertical bar.
Press G to grab your selection, type -99 to move the keyframes back 99 frames and press enter.


The keyframes that were at the 200th frame mark should now be at the 101th frame. Now when you cycle from the 100th frame to the next frame, it should act as though you were cycling straight to the 200th frame.